JI Y X, LI H H, SONG G F.Study on surrounding rock stability of partially filled mining face under the influence of filling stiffness and filling step[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):49-56.

doi:10.16186/j.cnki.1673-9787.2022010024

Received:2022/01/08

Revised:2022/05/23

Published:2023/09/25

Study on surrounding rock stability of partially filled mining face under the influence of filling stiffness and filling step

JI Yuxin, LI Hehe, SONG Gaofeng

School of Civil Engineering，North China University of Technology，Beijing 100144，China

Abstract:In order to further study the movement law of overburden in partial backfill mining technology，the equation was developed by using the elastic foundation beam theory to reveal the relationship between the filling elastic foundation coefficient as well as the direct roof elastic modulus and the roof subsidence，the Phase2D finite element numerical model was established to study and analyze the overburden movement under different backfill stiffness and different backfill steps. The results showed that the final subsidence of the direct roof decreased with the increase of the elastic foundation coefficient of the filling body； with the increase of roof elastic modulus，the direct roof subsidence in the working face decreased gradually，while the direct roof subsidence in the filling area didn’t change much. With the increase of filling body stiffness and backfill steps，the plastic zone in front of the longwall face，the deflection of direct roof in the working area and the vertical displacement of overburden above the longwall face all decreased accordingly，and among the influence factors of the filling step on the stability of the overburden，the height width ratio was more significant than the timely support.

Key words:partial backfill;backfill step;filling body stiffness;direct roof subsidence;surrounding rock stability

部分充填开采工作面覆岩移动规律研究_冀宇鑫.pdf